"Hillary Clinton is good for United States versus Donald Trump, who has no solutions," Mateen said.

He also unfurled this banner he made to show his support for Clinton:

Just like Hillary Clinton, Mateen supports disarming Americans so they can't fight back against people like his son -- whom Hillary supports flooding this nation with.

After news of his attendance spread on social media and was placed on the top of Drudge Report, the Clinton campaign chose not to disavow his support.

"The rally was a 3,000-person, open-door event for the public," the Clinton campaign's short statement read. "This individual wasn't invited as a guest and the campaign was unaware of his attendance until after the event."

The same media which freaked out over David Duke saying he'd vote for Trump because he agrees with him on some issues, is now going to ignore the father of the Orlando shooter -- responsible for the most deaths in a single mass shooting in the nation's history -- giving his full endorsement to Hillary Clinton and being placed directly behind her at her own rally by her own staff!

Imagine the sh*tstorm if the Trump campaign had placed David Duke, who has no connections to any murders but was in the KKK 40 years ago just like Robert Byrd, directly behind Trump during a rally in Louisiana!

Our media still demands Trump disavow Duke every week, yet we all know because they're in the tank for Hillary Clinton and fear Donald Trump overthrowing the establishment they control, they're trying their hardest not to make this an issue!